Troubleshooting - AKG Acoustics HEARO 787 SURROUND Mode D'emploi

6 Troubleshooting

Symptom
No sound.
CHARGE label is not lit.
Mono sound.
Noise.
Distorted sound.
Intermodulation noise.
Headphones receive unwanted
transmitters.
Overemphasized bass or treble range.
16
Possible Cause
1. AC adapter is not connected to transmitter
and/or AC outlet.
2. Transmitter is OFF or not connected to
audio source.
3. Connected audio source is switched off.
4. Volume control on audio source is set too
low.
5. Batteries are low.
6. Headphones are OFF.
7. Volume control on headphones is
at zero.
1. Transmitter is not connected to AC power.
2. No batteries inside the headphones.
3. Batteries are not correctly aligned with
polarity marks.
4. Headphones are incorrectly positioned on
transmitter.
1. Connected audio source operates in mono
mode.
2. Transmitter is not correctly connected to
audio source.
1. Transmitter and receiving frequencies are
not identical.
2. Audio level at transmitter input is too low.
3. Input signal is noisy.
4. Batteries are dead.
• Batteries are dead.
1. Electrical appliances with poor interference
protection.
2. Audio source or sound carrier defective.
• A neighbor uses similar UHF headphones.
• Bass or treble control settings on audio
source.
Remedy
1. Connect AC adapter to transmitter and/or
AC outlet.
2. Switch transmitter on or connect to audio
source.
3. Switch audio source on to feed signal to
transmitter input.
4. Increase volume to the point that LEVEL
illuminates.
5. Charge batteries.
6. Switch headphones on.
7. Set volume control to desired level.
1. Connect transmitter to AC power.
2. Insert batteries.
3. Check orientation of batteries in battery
compartment.
4. Place headphones on transmitter correctly.
1. Switch audio source to stereo mode.
2. Check cable connection between trans-
mitter and audio source.
1. Near the transmitter, press AUTOTUNING
switch on headphones or use FREQ key on
transmitter to select different carrier
frequency and press AUTOTUNING on
headphones.
2. Turn up audio source volume control and/or
INPUT LEVEL control on transmitter.
3. Check audio source.
4. Charge batteries.
1. Charge batteries.
1. Switch off any "suspicious" appliances (if
possible).
2. Check audio source or sound carrier.
• Use FREQ key on transmitter to select dif-
ferent carrier frequency and, staying close
to transmitter, press AUTOTUNING switch
on headphones.
• Readjust bass and/or treble controls.
HEARO 787 SURROUND